Coherent transport of spin by adiabatic passage in quantum dot arrays

Abstract

We introduce an adiabatic transfer protocol for spin states in large quantum dot arrays that is based on time-dependent modulation of the Heisenberg exchange interaction in the presence of a magnetic field gradient. We refer to this protocol as spin-CTAP (coherent transport by adiabatic passage) in analogy to a related protocol developed for charge state transfer in quantum dot arrays. The insensitivity of this adiabatic protocol to pulse imperfections has potential advantages for reading out extended spin qubit arrays. When the static exchange interaction varies across the array, a quantum-controlled version of spin-CTAP is possible, where the transfer process is conditional on the spin states in the middle of the array. This conditional operation can be used to generate N-qubit entangled GHZ states. Using a realistic noise model, we analyze the robustness of the spin-CTAP operations and find that high-fidelity (>95%) spin eigenstate transfer and GHZ state preparation is feasible in current devices.

11 pages, 8 figures, comments welcome; v2: Minor updates

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Cited by in corpus (13)

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• Flying Spin Qubits in Quantum Dot Arrays Driven by Spin-Orbit Interaction
• Noise Classification in Three-Level Quantum Networks by Machine Learning
• Nonadiabatic quantum control of quantum dot arrays with fixed exchange using Cartan decomposition
• Resonator-mediated quantum gate between distant charge qubits
• Pauli Spin Blockade in a Resonant Triple Quantum Dot Molecule
• Electrical Interconnects for Silicon Spin Qubits
• Channel capacity of small modular quantum networks in the ultrastrongly coupled regime
• Efficient electron transfer in quantum dot chains controlled by a cubic detuning profile via shortcuts to adiabaticity